I have a slim line 49mm B&W MRC UV filter on my X100 - I am using the adapter that comes with the lens hood. Without the lens hood, obviously, I can still use the X100's original lens cover. I am not sure that anything larger would work. Some filters, such as the one I bought, come with their own little rubbery plastic cover...which could be OK.

Hope this is of some help, Keven. Meanwhile, perhaps someone else will pipe in?

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